Mount Price is a small stratovolcano in the Garibaldi Ranges of the Pacific Ranges in southwestern British Columbia, Canada. It is located 10 km (6.2 mi) southeast of Garibaldi above the eastern flank of the Squamish River valley. With a summit elevation of 2,052 m (6,732 ft) and a topographic prominence of 402 m (1,319 ft), it rises above the surrounding landscape on the western shore of Garibaldi Lake. A large provincial park surrounds Mount Price, as well as other volcanoes in the area.
The mountain is associated with a small group of related volcanoes called the Garibaldi Lake volcanic Field. This forms part of the larger Garibaldi Volcanic Belt, a portion of the Canadian Cascade Arc, which extends from the Ha-Iltzuk Icefield in the north to Watts Point in the south. Mount Price began its formation 1.2 million years ago and continued intermittently until about 10,000 years ago. Even though the mountain has not erupted since the early Holocene epoch, it could erupt again to cause disruption in the area. If this were to happen, relief efforts would be quickly organized. Teams such as the Interagency Volcanic Event Notification Plan (IVENP) are prepared to notify people threatened by volcanic eruptions.
Mount Price is one of the three principal volcanoes in the southern segment of the Garibaldi Volcanic Belt. In contrast to most stratovolcanoes in Canada, Mount Price has a nearly symmetrical structure. It is one of the several Garibaldi Belt volcanoes that have been active in the Quaternary period. Clinker Peak, a breached lava ring on its western flank, was formed during a period of volcanic activity about 10,000 years ago. The red colour of Mount Price is from oxidation of the volcanic rocks.
Like other volcanoes in the Garibaldi Volcanic Belt, Mount Price formed as a result of subduction-related volcanism. As the Juan de Fuca Plate subducts under the North American Plate at the Cascadia subduction zone, it forms volcanoes and volcanic eruptions. Unlike most subduction zones worldwide, there is no deep oceanic trench present along the continental margin in Cascadia. There is also very little seismic evidence that the Juan de Fuca Plate is actively subducting. As a result, the existence of active volcanism in the Cascade Volcanic Arc is the best evidence for ongoing subduction. However, volcanic activity along the Cascade Arc has been declining over the last few million years.
The probable explanation lies in the rate of convergence between the Juan de Fuca and North American plates. These two tectonic plates currently converge 3 cm (1.2 in) to 4 cm (1.6 in) per year. This is only about half the rate of convergence from seven million years ago and probably explains the reduced seismicity and lack of an oceanic trench.